Dental separating or grinding disk



G. O. BURLEW.

DENTAL SEPARATING 0R GRINDING DISK. APPLICATION FILED OCT. 21. 1918.

1,350,002. Patented Aug. 17,1920.

ATTORNEY GILDEROY O BURLEW, OF NEWARK, NEW JERSEY.

DENTAL SEPARATIN G 0R GRINDING DISK.

Application filed October 21, 1918.

To all whom it may concern:

Be it known that I, GiLnnnoY O. BURLEW, a citizen of the United States, residing in the city of Newark, .in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Dental Separating or Grinding Disks, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, and to numerals of reference marked thereon, forming a part of this specification.

It is customary in dental work to employ wheels or disks upon a revolving mandrel for the purpose of separating teeth, cutting, grinding, and shaping the same.

The object of my invention consists in combining a separating or grinding disk with a metal disk having a diameter slightly larger than that of the separating or grind ing disk, and mounting the same upon the mandrel of a dental engine so that the circumferential edge of the metal disk will be in advance of the circumferential edge of the separating or grinding disk to separate the tooth, to be operated upon, from the adja cent tooth, thereby preventing injury to the adjacent tooth.

The separating or grinding disks referred to are commonly made of carborundum, and owing to the thinness of the same, frequently break when cutting or grinding a tooth, due to the fact that during the cutting or grinding operation the disk becomes slightly flexed. The application of metal disk to a separating disk has a tendency to support the thin, fragile carborundum disk during the grinding or cutting operation, and the accidental breakage ol the separating or grinding disks so mounted is consequently reduced to a minimum.

These objects'I perform in the preferred embodiment of my invention, which I have illustrated in the accompanying drawings, to which reference is had, and in which similar reference numerals illustrate corresponding parts in the several views.

In the drawings,

Figure 1 represents a side elevation of a mandrel and applied disks.

Fig. 2 represents an end view of the same.

Fig. 3 represents, on an enlarged scale,

Specification of Letters Patent.

Patented A11 17, 1920. Serial No. 259,005.

a side elevation mandrel and disks as applied to use.

Fig. 4 represents a side elevation of a modified form of my invention, and

Fig. 5 represents, on an enlarged scale,

a transverse section taken on line mw of Fig. 4%. In the drawings, 1 represents the mandrel in common use, to one end of which is rigidly secured, by means of a screw 2, an apertured separating disk 3 of any well known type, and a comparatively thin apertured metal disk 4; in order that both the separating disk 3 and the metal disk l will rotate together. The thin metal disk 4-, as shown, is larger in diameter than the separating disk 3, in order to provide a circumferential edge 5 in advance of the circumferential edge of the separating disk 3. This construction is very eliicient for cutting space between a sound tooth (3 and a detective tooth 7 without injury to the enamel of the sound tooth, serving the double purpose of causing the advanced circumferential edge 5 of the metal disk 1- to separate the teeth 6 and 7 to be operated upon, and as previously stated, providing a support for the fragile separating disk 3 during the grinding operation, thereby reducing the accidental breakage of said disks to a minimum.

In the modified form illustrated in Figs. land 5 of the drawings, I have shown a metallic strip 8 and a carborundum strip 9, suitably held in a saw frame 10 in any desired or convenient manner, with the edge 11 of the metallic strip 8 in advance of the edge of the carborundum strip 9 to serve the same purpose as above described.

The device described has been put into actual use and has been found eflicicnt for the purposes had in View. It is of small cost and may be very quickly and easily applied to and removed from a mandrel or frame. I am familiar with the commercialseparatingdisks, comprising a metal. disk, one side of which is coated with can borundum and, in practice these disks are of very little use for the reason that sufiicient carborundum cannot be applied to the metal disk to give the disk the stability and efficiency necessary for the required work.

I am also familiar with that type of carborundum separating disk, provided with a smooth and a cutting surface, whi h also in practice, has been found objectionable on partly in section, of the account of the large percentage of breakage, owing to its fragile nature, when flexed to any appreciable degree on account of the strain placed upon it. It will be understood that in practice modifications of the specific construction shown may be made and any suitable materials and proportions may be used for the parts Without departing from the spirit of the invention.

In practice I employ a very thin and spring steel, preferably Swiss steel, for the metal disk and strip, and it is to be under stood that the metal edge is very slightly in advance of the carborundum edge of the disk or strip.

this 18th day of October, 1918.

What I claim is The combination wlth the frame of a dental tool, and a separating strip mounted therein, of a metal strip also mounted in said frame andrigidly secured to said separating strip, the longitudinal edge of the metal strip being in advance of the longitudinal edge of the separatingstrip.

This specification signed and witnessed GILDEROY O. BUR-LEW.

lVitnesses i FREDK G. FISCHER, ANNA EGAN. 

